Go into Settings, Cellular, and uncheck the switch for every app except the ones you really want to use when you’re not on wi-fi. Scroll all the way down the page and uncheck wi-fi assist. Go into Facebook and uncheck autorun videos.
Did it. Gee, thanks, ya’ll!!
Ditto,,,
This. I have wifi and still did this. Don’t want crap running all the time. Also close out every app after I use it. Swipe em closed.